Increasing and Reducing Friction

9.4 Increasing and Reducing Friction

Description

Key Concepts

  • Friction is necessary for motion control and safety.

  • Friction can be increased or decreased depending on the situation.

  • Lubricants reduce friction between moving parts.

  • Rolling friction is less than sliding friction.

  • Fluid friction affects objects moving through liquids and gases.

Memory Aids

🎵 Rhymes Time

  • Friction is the friend we need, helps us walk, drive, and succeed.

📖 Fascinating Stories

  • Imagine a world without friction: cars would slide off roads, we’d tip and fall everywhere. Friction keeps everything in place!

🧠 Other Memory Gems

  • To remember types of friction, think of SS-R: Static, Sliding, and Rolling.

🎯 Super Acronyms

L.O.S.E. — Lubricants Offer Smooth Operation, a reminder of how lubrication helps reduce friction.

Examples

  • The grooves in shoe soles and tire treads increase friction for better grip.

  • Pouring oil on a door hinge reduces friction and allows smooth movement.

  • Sports equipment, like soccer shoes, uses spikes to increase grip.

  • When moving heavy objects, using rollers reduces sliding friction.

Glossary of Terms

  • Term: Friction

    Definition:

    The resistance encountered when one surface slides over another.

  • Term: Lubricants

    Definition:

    Substances used to reduce friction between surfaces.

  • Term: Static Friction

    Definition:

    Friction that exists between a stationary object and the surface it is resting on.

  • Term: Sliding Friction

    Definition:

    Friction that occurs when an object slides over a surface.

  • Term: Rolling Friction

    Definition:

    The frictional force resisting the motion when an object rolls over a surface.

  • Term: Fluid Friction

    Definition:

    Friction experienced by objects moving through fluids such as liquids and gases.

  • Term: Drag

    Definition:

    The resistance force experienced by objects moving through a fluid.

  • Term: Interlocking

    Definition:

    The mechanism by which imperfections in surfaces come together, increasing friction.